Leech/Putrescent Servitude

not sure on this one, do Leech and Putrescent Servitude stack so an ally could play superior potence cards? i fear not, but would be fun!

Leech
[Action] Action

Requires a ready mortal, ghoul, or mage. Steal a blood (it becomes a life) from a vampire controlled by another Methuselah and untap this ally. Burn any conviction [1 CONVICTION] cards on this ally. This ally may play cards requiring Potence [pot] as a vampire until his or her next untap phase.

Putrescent Servitude
[Action] Action
[Thanatosis] Thanatosis

[1 Blood]

+1 stealth action.
[thn] Move any mortal or ghoul retainer you control to this vampire, or put this card on a mortal or ghoul ally you control. This ally gains 1 life, and he or she may play cards that require basic Potence [pot] as a vampire.
[THN] As above, but take any mortal or ghoul retainer or put this card on any mortal or ghoul ally and take control of that ally.